150 BUCCINID^, 



Shell oval, thin, ventricose ; spire very short ; body-volution 

 large, not produced below ; aperture large, terminating below in 

 a rounded sinus ; outer lip thin and simple ; inner lip very thin, 

 smooth, and closely and very broadly folded upon the imper- 

 forate umbilical region and body-volution above, so as to form, 

 "with a low revolving umbilical ridge, a kind of profoundly arcu- 

 ate, strongly spiral, false columella ; surface with more or less 

 distinct revolving lines and furrows. 



Meek is inclined to believe that Bullia ampullacea is a living 

 example of his genus ; if so, Volutharpa, Fischer, will have pri- 

 ority over Pseudobuccinum. 



Odontobasis, Meek. 



Distr 0. fen^rzcosa. Meek (li, 68). Cretaceous; Dakotah. 



Shell buccinoid-fusiform ; spire more or less produced ; bodj^- 

 volution ventricose, and separated below from the short narrow 

 beak, by a sharply-defined, narrow, revolving sulcus, that termi- 

 nates below at the connection of the outer lip with the canal, in 

 a small tooth-like projection; outer lip thin, smooth within, and 

 nearly straight in outline ; inner lip not thickened, but well- 

 defined ; columella a little twisted, slightly flattened, and bearing 

 two oblique plaits below, the lower one of which is formed by 

 the raised lower edge of the obliquely truncated columella, and 

 the other, which is very obscure, or perhaps sometimes obsolete, 

 placed a little above the same ; surface ornamented by vertical 

 folds and revolving lines and furrows. 



This genus, referred doubtfully to the Buccinidse by Meek, 

 seems to unite characters of several diflTerent groups ; the shell 

 is Buccinoid in form and sculpture, but the fold and tooth 

 remind one of Fasciolarise, whilst the truncate columella recalls 

 the Nassse. 



EcTRACHELizA, Gabb. 



Distr. — U. truncata^ Gabb (li, 69). Miocene ; San Domingo, 

 W. I. 



Shell acuminately oblong, spire elevated (always truncated 

 in the only species known). Surface compressed near the suture. 

 Inner lip incrusted ; columella sinuous, short ; outer lip produced 

 in advance. 



This genus seems to be allied in many of its characters to 

 Cominella and Truncaria. Like them, it is compressed adjoining 

 the suture. It shows no trace of umbilicus, as seen in most of 

 the Buccinidee, but its most distinctive character is in its obliquely 

 subtruncated columella, which does not reach to the anterior end 

 of the shell. 



Brachysphingus, Gabb. 



Distr. — B. lirataSj Gabb (li, *rO). Cretaceous ; California. 



